Grinding machine



- 1497,436 9 I924 F. E. GARDNER GRINDING MACHINE Filed- July 28. 1919 2 Sheets-Sheet 1 June 10, 1924.

1,497,436 F. E. GARDNER GRINDING MACHINE Filed July 28. 1919 2 Sheena-Sheet 2 Patented June 10, 1.9 24.

Artur FFICE.

FREDERIC n. GARDNER, or 13183011, WISCONSIN.

GRINDING MACHINE.

Application filed July 28, 1919.

One object of my invention is to providesuch a work-table which may be manually pressed against the grinding element and fed across the face of said element by power.

Another object is to provide a single hand lever for controlling in a simple man-' ner both the pressure and the power feed.

A special object is to arrange the transmission so that the motions of the single control lever for producing the different movements of the work-table are substantially similar to the motions required for producing the same movements manually on the common type of rocker-shaft machine which has no power feed.

Further objects and advantages of my invention will be apparent as the description proceeds.

In the accompanying drawings, Figure 1 is a plan view and Fig. 2 is a side elevation of a grinding machine, showing one embodiment of my invention. Fig. 3 is an end elevation of the machine and Fig. 1 is an enlarged section. on the line 4E' 1 in Fig, 1.

In the embodiment of my'invention selected for illustration, a pedestal 10 carries a knee 11 at each end and a shelf 13 extendingpast one side of a vert'ical column 12, said shelf joining thetwo knees and the shelf and knees having an upstanding perimetrical flange to form av continuous pan, which is reinforced from beneath by suitable webs 11 and 13 The column 12 carries a shaft 14: in suitable bearings at its upper end. Grinding wheels 15 and 16 are mounted at either end of the shaft, and power is transmitted to it by-means of a pulley 17 located. at the center. In the drawings only one of the knees 11 has been illustrated. The other knee may be similar to the one shown or may be equipped with any other desired type of work-table.

A work-table column 18 is vertically slidable in a sleeve 19 carried by a base 20. The

Serial No. 313,667.

base 20 is mounted for sliding adjustment" toward andaway from the grinding wheel on ways 21 and 22, projecting upward from the floor of the knee 11 as shown in Fig. 3,

and may be clamped in adjusted position by any suitable means such as clamping bolts 20 acting on a suitablegib. The

-floor of the knee 11 is cut away between the ways 21 and 22 from an upwardlyextending partition 23 adjacent the column 12 to another partition 24: at the outer end of the knee. The upper part of the farther partition 24: slopes inwardly and upwardly and extends farther toward the column than the extreme position of the. sliding base 20. It will be seen that when water or some other suitable lubricant is used on the grinding wheel, as disclosed for instance in my prior Patent No.

' 1,207,535, Dec. 5, 1916, there will in no position of adjustment of the sliding base 20' be any aperture through which the water falling onto the knee 11 can pass into the space immediately surrounding the hearing 19.

The column 18 may be manually raised and lowered by means of a suitable worm 25 meshing with a worm wheel 26 on a horizontal axle 27 carrying a gear 28 meshing with a rack 29 set into the face of said column 18. s I

A carriage 30 is integrally unitedwith the upper end of the column 18 and carries a saddle 31 movable toward and away from the grinding wheel on guideways 32', and a work-table 33 is slidably mounted in a transverse guideway 34: on thesaddle 31.

Means are provided for manually pressing the saddle 31 toward the wheel 15 and for feeding the table 33 transversely on the saddle across the face of the grinding wheelby power. Theipower feed for the work-table comprises, in this instance, a pulley 35 mounted on a horizontal shaft 36 suitably supported by brackets 37 near the end of the pedestal 10, and receiving power from any desired source. The shaft 36 carries a cone of pulleys 38 of varying sizes from which a belt 38 transmits power to a second shaft 39 carrying similar pulleys 10. The second shaft 89 is rotatably mounted in bearings in the pedestal 10 and in a bracket 41 depending from the sliding base 20 and restrained from longitudinal move ment in said bracket 41 by suitable collars. The pulleys 4:0 are splined to the shaft '39 47 to the clutch gears.

to allow it to slide in and out upon adjustment of the sliding base 20. A bevel gear 42 meshes with a bevel gear 43 carried by the bracket 41 and driving a vertical shaft 44 splined through it. The shaft 44 is carried b i a bracket 44 on the carriage 30 (see Fig. 13 to move up and down with the vertical adjustment of the carriage. At its upper end the shaft 44 carries a suitable bevel gear 45 meshing with a gear 46 to drive a; horizontal outwardly extending shaft 47 journaled in the butt of a bracket 48 extending from the carriage 30. A bevel gear 49 at the outer end of shaft 47 is continually in mesh with each of a pair of bevel gears 50 and 51 on a horizontal shaft- 52 journaled at one end in the carriage 31 and at the other in a curved extension of the bracket 48. The work-table is adapted to be fed across the face of the grinding wheel by a rack 53 (Fig. 4) meshing with a pinion 54 on the end of a main control shaft 55 carrying a worm wheel 56 engaging a. worm on the horizontal shaft 52. A collar splined on the horizontal shaft'52 and engaged by suitable fingers 57 carries suitable clutch elements such as lugs 58 adapted to engage either one of the bevel gears 50 and 51 driven in opposite directions by gear 49.

It will be seen that power from pulleys 40 will be received by shaft 39in any position of the base 20, and transmitted up the vertical shaft 44, and out the horizontal shaft From the clutch it may pass through shaft 52, worm 56, main control shaft 55 and gear 54 to slide the work table 33 in either direction.

The main control shaft 55 is adapted not only to transmit the transverse feed to the worktable 33, but also to apply pressure against the grinding wheel by means of the slidable mounting of the saddle 31. To ac complish this the main control shaft is splined to the worm wheel 56 as shown by the slot 56 indicated in dotted lines in Fig.

4. The inner end of the shaft is carried in a bearing 57 formed in a suitable lug depending from the saddle 31. Manual means for sliding the main control shaft through the worm wheel 56 and forcing the saddle 31 towards the grinding wheel comprise a lever arm 58 adapted to rotate a shaft 59 carrying a toothed wheel 60. A series of annular projections or rings 61 on the main control shaft engage the teeth on this wheel. It will be seen that rotation of the shaft 59 by means of the handle will force the main control shaft and the saddle 31 toward the grinding wheel without interfering in any way with the rotary movement of said main control shaft which simultaneously transmits the transverse feed from the ,worm wheel 56 to the gear 54. A thrust bearing 62 receives the manual pressure thus applied.

It will be apparent that the length of the lever 58 and the radius of the toothed wheel may be proportioned to allow very large forces to be exerted to hold the work against the grinding element, by means of a mod erate manual force applied to lever 58. It should also be noted that the transmission for pressing the work against the grinding element is reversible, i. e., it does not contain any elements having sliding contact with each other and moving at an angle to the plane of contact less than the critical sliding angle, and it can therefore be operated by the application of force at either end of the transmission. The removal of the operators hand from the lever will therefore immediately relieve the pressure of the work on the grinding element because the trans mission is reversible and has no locking action. The sensitiveness thus obtained in the means for pressing the work against the wheel is one of the important features of my invention.

My invention comprises means whereby the lever 58 may be raised and lowered by rotation around the axis of the main control shaft 55 to control the power feed, simultaneously with its use to press the work against the grinding element. .For this purpose the lever 58, shaft 59 and wheel 60 are mounted in a casing 63 journaled on the end of the main control shaft 55, and rotatably mounted by means of a flange 64 engaging the face of the casing 65 for the worm wheel 56, and held in place by a suitable collar 66. A flange on the rotatable casing carries a gear wheel 67 meshing with rack teeth on a bar 68 slidably mounted in suitable lugs 69 projecting from the easing 65, said bar extending parallel to the clutch shaft 52, and at its end carrying the fingers 57 which control the'clutch for starting, stopping or reversing the power feed. Tilting of the entire casing 63 and lever 58 around the axis of the main control shaft 55 will have no effect upon the application of pressure manually through the rings 61 which are free to rotate with the shaft 55 in sliding engagement with the toothed wheel 60. It is therefore possible by simple and readily acquired movements of one hand only to simultaneously apply any desired amount of pressure against the grinding wheel and by slight vertical movements of the hand, control the power feed across the face of the wheel. I

In the common type of rocker-shaft table the operator presses the work against the grinder by pushing forward either on the table or on a lever similar to lever 58, and feeds the work across the face of the grinder manually by lifting or hearing down on the lever to rock the table on the rocker shaft. This last movement requires a great deal of power and limitsthe size of the work that can be handled to a considerable extent. According to my invention this feed ing movement is accomplished by the use ofpower, and'the control lever governing the application of'power is moved in a sub stantially similar way to produce a given movement as if the table were being manually rocked to and fro. On this account a relatively unskilled workman can be quickly taught to use the improved machine.

While I have shown and described 'the preferred embodiment ofmy invention, it

should be understoodthat the disclosure is illustrative only, as many modifications will naturally occur to a skilled workman in using my device. I aim in the sub]oined claims to cover all such legitimate modifica-' tions.

I claim as my invention:

1. A grinding machine having, in combination, a work-table, a source of power,

an operating element, a transmission from 7,

whereby rotation of said lever" around one of said axes will move said work-table 'in either direction along a given horizontal line, and whereby rotation of ,said'lever around the other of said axes will move said table in either direction along a second horizontal line at right angles to the first mentioned horizontal line. I

3. In a device of the class described, in combination, a work-table adapted to move in either of two mutually perpendicular lines of motion, a control lever ad'aptedto rotate around two mutually perpendicular axes, a source of power, andoperative-connections between said source of power, said lever and said table whereby rotation of said lever around one axis will manually move said table in either direction in one line of motion and whereby rotation of said lever about the other axis will apply power to said table to move it in either direction in the other line ofmotion.

4. In a grinding machine, in combination, an operating element, a work-table, a control lever, a source of power; means whereby pressing the end of said lever toward said operating element will apply pressure to force said table toward said element, and means whereby raising and lowering the end of said lever will apply power to said table to feed it across the face of said disk in either direction.

5. In a device of the class described, in

combination, a shaft, a worm wheel on said shaft, a casing rotatable about the axisof said shaft, asource of power, a reversing clutch adapted to connect said source of power to said worm wheel to rotate it in either direction, and a connection between said rotatable casing and said reversing clutch for controlling said clutch by rotating said casing.

6. In a device of the class described, in

combination, a shaft, a worm wheel on said shaft, a casing rotatable about the axis of said shaft, a source of power, a reversing clutch adapted to connect said source of power to said worm wheel to rotate it in either direction, a connection between said rotatable casing and said reversing clutch for controlling said clutch by rotating said casing, and means in said rotatable casing for applying an end thrust to said shaft,

7. In a device of the class described, in combination, a shaft, a worm wheel on said shaft, a casing rotatable about the axis of said shaft, a source oflpower, a reversing clutch adapted to connect said source of power to said worm wheel to rotate it in either direct-ion, a connection between said rotatable casing and said reversing clutch for controlling said clutch by rotating said casing, means in said rotatable casing for applying an end thrust to said shaft, and a single control element carried by said casing for applying end thrust and for rotating said casing,

8. A grinding machine having, in com-,

bination, a body, a support on said body, a base slidable on said support, a work table carried by said base, said work table being slidable with respect to said base in a direction parallel to the sliding motion of said base, means for clamping said base on said support, means for moving said work. table with respect'to said base by hand pressure, said work table being also slidable in another direction at right angles to the first mentioned direction, power means for feeding said worktable in said last mentioned direction, and a single manual control element adapted to apply hand pressure to said table and to control said power feed,

9. In a grinding machine, in combination, an operating element, a work table, ashaft free to slide in the direction of its axis and also to rotate upon its axis independently of said sliding motion, connections between said shaft and said table for sliding said table parallel to the axis of the shaft in unison with said shaft and for sliding said table at right angles to the first mentioned direction of sliding upon rotation of the shaft. 7 7, 9

10. In a grinding machine, in combination, an operating element, a work table, a shaft free to slide in the direction of its axis and also to rotate upon its axis independently of said sliding motion, connections between said shaft and said table for sliding said table parallel to the axis of the shaft in unison with said shaft and for sliding said table at right angles to the axis of said shaft upon rotation of the shaft, manual means for producing one of said motions and power driven means for producing the other of said motions.

11. In a grinding machine for finishing flat surfaces, an operating element, a work table, power driven means for reciprocating the work table across the face of the element, and means for pressing the work table toward the element by hand pressure, a single control element and connections operatively associated with said control element for pressing the work table toward the operating element and for controlling said power driven means,

12. A machine of the character described having, in combination, an operating element, a support, a work table on said support movable in each of two mutually perpendicular directions, a single control element on said support and connections between said control element and said work table for independently controlling both movements of said table.

18. In a grinding machine, in combination, a. column, a knee projecting from said column, a base slidably mounted on said knee, a vertically adjustable carriage carried on said base, a horizontally movable saddle mounted on said carriage, and a worktable slidably mounted on said saddle for motion at right angles to the direct-ion of motionof said saddle, a single control element on said carriage, and connections between said control element and said saddle and table for the independent control of both.

14. In a grinding machine, in combination, a column, a knee projecting from said column, a horizontally slidable base carried by said knee, means projecting downwardly from said horizontally slidable base to receive a connection for the transmission of power,

said knee being apertured for the passage of vsaid downwardly extending means, the walls defining the aperture being extended under said horizontally slidable base.

15. In a device of the class described, in combination, a work-table mounted for movement in either of two directions at right angles to each other, manual means for moving said table in one direction, and power driven means for moving said table in the other direction, and a single control element governing the motion of said table by both of said means.

16. In a device of the class described, in combination, a slidable carriage, a worktable on said carriage slidable in a direction at right angles to the direction of motion of said carriage, a bearing in said carriage, a shaft rotatable but not slidable in said bearing, and extending parallel to the direction of motion of said carriage, a gear on the end of said shaft meshing with a rack on said table whereby rotation of said shaft will slide said table on said carriage, and means for exerting an end thrust on said shaft.

17. In a device of the class described, in combination, a longitudinally extending shaft having two independent motions one of longitudinal axial sliding and one of 1'0- tation around its own axis, a work-table slidable longitudinally and also transversely, means forcing said table to move longitudi nally With said shaft and a connection between said shaft and said table operative to move said table transversely upon rotation of said shaft.

18. A machine of the character described having in combination, an operating ele ment, a support having an aperture therein, a base slidably mounted on said support and over said aperture, the walls of said aperture being bent upward under said base to prevent the coolant from passing therethrough, a saddle supported by said base and adjustable vertically thereto, a table mounted on said saddle for horizontal ad justment along the face of said operating element, and means for manually controlling the horizontal position of said table. I

In testimony whereof, I have hereunto set in hand.

y FREDERIO, E. GARDNER. 

